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Slide rule in leather case -- Keuffel & Esser Co #4081-3, 1940s
$8.99 USD

Sold on: 2013-Dec-27

Marketplace: eBay
1 Treasure
0 Trash
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Detail:

Classic Keuffel & Esser Log Duplex DeciTrig slide rule. The latest patent dates from 1940, and Mr. Lundin was already a graduate student in Chicago by 1950, so the timeline for dating this is pret...




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